The warning light doesn't tell you how healthy the battery is, it tells you if there are any problems with the charging system. A flickering light means charging is intermittant for some reason, so it would be worth checking the alternator or voltage regulator, which might be on the way out. It's worth also checking that the warning light circuit and bulb are ok - if it lights up brightly and continuously when you switch the ignition on, then goes off when you start the engine, it's ok. Hope that helps.
On a 2004 Mercury Sable : The battery is in the drivers side of the engine compartment at the front
It is possibley your alternator or battery
On a 2001 Mercury Sable : The battery is located in the front of the engine compartment , on the drivers side
check the recalls!!
Because you are about to throw a rod. You need to find a mechanic quick!
It's probably misfiring. You would need to diagnose why.
On a 1997 Mercury Mountaineer : The " CHECK ENGINE " warning light is just to the left of the battery voltage gauge
The most likely cause is a dirty fuel filter that starves the engine.
Clean the battery cables and make sure the wires to the alternator are tight and without corrosion.
I believe it is mounted below the battery tray in the engine compartment
If this is a general noise, it could be the transaxle. When you are accelerating, the engine is pushing the gears, and when you let go of the pedal, the vehicle starts to shift back down. If this is an engine noise, it could be predetonation or a valve problem.
Usually on the lower end of the engine follow the + battery cable to the solenoid and then to the starter
Try disconecting the battery for 5 min.s and reconecting.
There is a battery light above the engine temperature gauge
The easiest way is to unhook the battery for a minute.
If the loose cable is the main one from the negative side of the battery, then everything will flicker simultaneously with the key on and the engine stopped. When the engine is running, the alternator will keep things energized. If you have a loose groung cable on one particular accessory, only that accessory will flicker or just remain off.
You either need a scan tool, or unhook the battery for a minute.
Sometimes the ground strap to the body of the car can come loose. This will cause things to flicker. Ground from the battery needs to be connected to the engine block, the frame, and the body to keep things working properly.
The battery should connect negative side to ground, positive side to the starter switch. Make sure that the wires do not rub to where they will short when going into the engine.
Check battery cables and alternator wiring for looseness and/or corrosion. Weak alternator--can't keep up with battery load. Check with a voltmeter A fully charged battery should read approx. 12.8 volts withou engine running With engine voltage should increase to approx. 13.8-14.2 volts. If not in this range replace
PULL THE DIPSTICK ! * The dipstick is located between the engine and battery on the driver's side.
You can try unplugging the battery to re set it or using a code reader on it
There are several things it could be, but the most obvious and common is a bad battery. Most people incorrectly diagnose this as the alternator, however, it is in fact a bad battery. The battery is not holding a charge and is constantly placing a full drain on the alternator produing your flickering/pulsing. Check the voltage on the battery with the engine off immediately after running the engine for at least 15min. Wait a few hours (overnight even better) and check the voltage again. Anything more than a tenth of a volt drop or even really hundredths or so and you have a failing battery. For ex. right after running if the battery reads 12.5V and then after say 8-12+ hours if the battery reads 11.9V you definitely have a failing battery. If it does not seem to be a bad battery, repost and we'll go from there on less likely causes.
the battery is a part of the vehicle as is the engine.
It needs a new engine... :(